target/user: Refactor data area allocation code

Introduce alloc_and_scatter_data_area()/gather_and_free_data_area()
functions that allocate/deallocate space from the data area and copy
data to/from a given scatter-gather list. These functions are needed so
the next patch, introducing support for bidirectional commands in TCMU,
can use the same code path both for t_data_sg and for t_bidi_data_sg.

Signed-off-by: Ilias Tsitsimpis <[email protected]>
Signed-off-by: Vangelis Koukis <[email protected]>
Reviewed-by: Andy Grover <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>

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